谐波锁模光电振荡器(特邀)

Harmonically mode-locked optoelectronic oscillator(Invited)

提出了一种主动锁模光电振荡器(OEO)方案,可以实现高阶谐波锁模,从而产生具有高重复频率的微波脉冲信号。在所提方案中,通过在OEO腔内的电光强度调制器直流偏置端口引入一个正弦驱动信号,当该正弦信号的频率f_(bias)为OEO环腔自由光谱范围的整数倍N时,实现基频(N=1)或谐波(N≥2)锁模,输出重复频率为f_(bias)的微波脉冲信号。实验中分别实现了 10阶、50阶和100阶谐波锁模,输出微波脉冲信号的重复频率分别为360 kHz、1.8 MHz和3.6 MHz。该方案为脉冲多普勒雷达等系统应用提供了一种全新的、具备低相噪潜力的微波脉冲信号产生的技术途径。

An actively mode-locked optoelectronic oscillator(OEO)scheme was proposed to generate highrepetition-rate microwave pulse signals based on high-order harmonic mode locking.In the proposed scheme,the bias port of the electro-optic intensity modulator in the cavity was driven by a sinusoidal signal.The frequency of the sinusoidal signal(f_(bias))was set to be N times of the free spectral range of the OEO cavity to realize fundamental(N=1)and harmonic(N≥2)mode locking,where the repetition rate of the generated microwave pulse signal was equal to f_(bias).In the proof-of-concept experiment,10 th-,50 th-and 100 th-order harmonic mode locking were realized,where the repetition rate of the generated microwave pulse signal was 360 kHz,1.8 MHz and 3.6 MHz,respectively.The proposed actively mode-locked OEO scheme provides a new way to generate low-phase-noise microwave pulse signals for pulse Doppler radar application.